function [xdx, xdy, ydx, ydy] = jacobian_matrix2d(vectorField)
% JACOBIAND_MATRIX2D Estimates the elements of the jacobian matrix
%
%   function [xdx xdy ydx ydy] = jacobian_matrix2d(vectorField)
%
%   INPUT ARGUMENTS
%   vectorField       - Vectorfield to estimate the Jacobian for
%
%   OPTIONAL INPUT ARGUMENTS
%   N/A
%
%   OUTPUT ARGUMENTS
%   xdx ...           - Matrix elements of the Jacobian

%   Copyright (c) 2012 Daniel Forsberg
%   danne.forsberg@outlook.com
%
%   This program is free software: you can redistribute it and/or modify
%   it under the terms of the GNU General Public License as published by
%   the Free Software Foundation, either version 3 of the License, or
%   (at your option) any later version.
%
%   This program is distributed in the hope that it will be useful,
%   but WITHOUT ANY WARRANTY; without even the implied warranty of
%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%   GNU General Public License for more details.
%
%   You should have received a copy of the GNU General Public License
%   along with this program.  If not, see <http://www.gnu.org/licenses/>.
%   adapted by Jinghao Lu, 05/11/2017

[xdx, xdy] = gradient_fast(vectorField{1});
[ydx, ydy] = gradient_fast(vectorField{2});
